[di-fyoo-zer] 
| 1. | a person or thing that diffuses. |
| 2. | (in various machines or mechanical systems, as centrifugal pumps or compressors) a device for utilizing part of the kinetic energy of a fluid passing through a machine by gradually increasing the cross-sectional area of the channel or chamber through which it flows so as to decrease its speed and increase its pressure. |
| 3. | (in a lighting fixture) any of a variety of translucent materials for filtering glare from the light source. |
| 4. | a pierced plate or similar device for distributing compressed air for aeration of sewage. |
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